(And, because I know that some people who come here are involved in activist
collectives...)
In case you're wondering, the authorities and secret services *do* listen to
conversations held near activists' cell phones (who are not even being
investigated for any crimes).
That's even how I first learned about this possibility. (After hearing about
the consequences of this.)
And why I researched about this, and found evidences - already, 10 years ago
- that corroborate what's said in the YouTube video I linked to.